I joke that the small business owner needs to print out paperwork. Rather than attempt to have a paperless office, plant a tree. One way I support planting trees is by contributing to the The Fruit Tree Planting Foundation.

The Fruit Tree Planting Foundation is a nonprofit charity
dedicated to planting 18 billion edible, fruitful trees and plants to benefit
the environment and all its inhabitants. Our primary goal is to plant trees
that yield edible fruits, nuts, leaves, or roots—thus spreading life-sustaining
ecological diversity throughout the world. While our ultimate vision is one of
overall ecological harmony, incorporating a great number of elements for a
self-sustaining world, we chose to name ourselves “The Fruit Tree Planting Foundation” to ensure that as our efforts continue, with the help of those who
join us, we will be united in the goal to heal the planet and nourish future
generations by planting fruit trees. 18 billion (with a "b") is quite
a few trees, but the world is depleted now, so many more fruit trees are
needed. We believe in thinking big and loving even more.